From what I've heard of the old TV Centre tours many people who knew a bit about the history of telly or the technology found the tour underwhelming and that the guides didn't really know their stuff.
I haven't seen reviews of the Salford tours but I wonder if we might be disappointed.
That's certainly the case with the NBH tours. You don't really see anything of interest (no studios for example). It's more about the history of broadcasting/television, which most of us already know, and interactive stuff.
At least at the TVC tours you went to studios/the newsroom and there was a greater sense of television history and magic.
I attended a recording at the Radio Theatre in BH/NBH recently. For that you are held for an hour or so prior to the performance in a bar area, with windows directly behind the 'trundle cam' on the newsroom balcony.
To be honest, that's quite good, you can stand and take in rehearsals for Outside Source, look into the glass box studio, and look down at Huw Edwards sat at his desk. There's also in that bar area, the old BBC 1 globe/mirror ident box, and the mechanical BBC 2 motorised box (both from the 'Noddy' era)